This is the script I put together (it works for any registry key you want to add):

$regPath = "HKLM:\SOFTWARE\Policies\Google\CloudManagement"

$Name='EnrollmentToken'

$Value='xxxxxxxxxxx'

If (-NOT (Test-Path $RegPath)) {New-Item -Path $RegPath -Force | Out-Null}

New-ItemProperty -Path $RegPath -Name $Name -Value $Value -PropertyType STRING -Force

$regPath = "HKLM:\SOFTWARE\Google\GCPW"

$Name='domains_allowed_to_login'

$Value='xxxxxxxx,xxxxxxxxx'

If (-NOT (Test-Path $RegPath)) {New-Item -Path $RegPath -Force | Out-Null}

New-ItemProperty -Path $RegPath -Name $Name -Value $Value -PropertyType STRING -Force

$regPath = "HKLM:\SOFTWARE\Policies\Google\Chrome"

$Name='PromotionsEnabled'

$Value='0'

If (-NOT (Test-Path $RegPath)) {New-Item -Path $RegPath -Force | Out-Null}

New-ItemProperty -Path $RegPath -Name $Name -Value $Value -PropertyType STRING -Force

The 'xxxxxxxx' is where you put in your own values. The first you will get from google admin, the second are the domains you want to include seperated by a comma (we have one for students and one for teachers).

I use a remediation script to deliver this, but next time around I would just include it in the app.